Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Loizu, J.; Morales, J. A.; Halpern, F. D.; Ricci, P.; Paruta, P.

doi:10.1017/s0022377817000927

Scrape-off-layer current loops and floating potential in limited tokamak plasmas

Journal Article · Fri Dec 01 04:00:00 EST 2017 · Journal of Plasma Physics

DOI:https://doi.org/10.1017/s0022377817000927· OSTI ID:1538929

Loizu, J. ^[1]; Morales, J. A.; Halpern, F. D.; Ricci, P.; Paruta, P.

DOE/OSTI

We investigate the question of how plasma currents circulate and close in the scrape-off-layer (SOL) of convection-limited tokamak plasmas. A simplified two-fluid model describes how currents must evacuate charge at the sheaths due to cross-field currents that are not divergence-free. These include turbulence-driven polarization currents and poloidally asymmetric equilibrium diamagnetic currents. The theory provides an estimate for the radial profile of the floating potential, which reveals a dipolar structure like the one observed experimentally. Simulations with a fluid turbulence code provide evidence for the predicted behaviour of currents and floating potential.

Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: FG02-95ER54309

OSTI ID:: 1538929

Journal Information:: Journal of Plasma Physics, Journal Name: Journal of Plasma Physics Journal Issue: 6 Vol. 83; ISSN 0022-3778

Publisher:: Cambridge University Press

Country of Publication:: United States

Language:: English

References (24)

On the electrostatic potential in the scrape-off layer of magnetic confinement devices Loizu, J.; Ricci, P.; Halpern, F. D. Plasma Physics and Controlled Fusion, Vol. 55, Issue 12 https://doi.org/10.1088/0741-3335/55/12/124019	journal	November 2013
Global 3D two-fluid simulations of the tokamak edge region: Turbulence, transport, profile evolution, and spontaneous E × B rotation Zhu, Ben; Francisquez, Manaure; Rogers, Barrett N. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4978885	journal	May 2017
Poloidal asymmetry in the narrow heat flux feature in the TCV scrape-off layer Tsui, C. K.; Boedo, J. A.; Halpern, F. D. Physics of Plasmas, Vol. 24, Issue 6 https://doi.org/10.1063/1.4985075	journal	June 2017
Plasma turbulence in the scrape-off layer of tokamak devices Ricci, Paolo; Rogers, B. N. Physics of Plasmas, Vol. 20, Issue 1 https://doi.org/10.1063/1.4789551	journal	January 2013
Boundary conditions for plasma fluid models at the magnetic presheath entrance Loizu, J.; Ricci, P.; Halpern, F. D. Physics of Plasmas, Vol. 19, Issue 12 https://doi.org/10.1063/1.4771573	journal	December 2012
Understanding and suppressing the near scrape-off layer heat flux feature in inboard-limited plasmas in TCV Nespoli, F.; Labit, B.; Furno, I. Nuclear Fusion, Vol. 57, Issue 12 https://doi.org/10.1088/1741-4326/aa84e0	journal	September 2017
Experimental Investigation of Dynamical Coupling between Turbulent Transport and Parallel Flows in the JET Plasma-Boundary Region Hidalgo, C.; Gonçalves, B.; Silva, C. Physical Review Letters, Vol. 91, Issue 6 https://doi.org/10.1103/PhysRevLett.91.065001	journal	August 2003
Simulation of plasma turbulence in scrape-off layer conditions: the GBS code, simulation results and code validation Ricci, P.; Halpern, F. D.; Jolliet, S. Plasma Physics and Controlled Fusion, Vol. 54, Issue 12 https://doi.org/10.1088/0741-3335/54/12/124047	journal	November 2012
Nonlinear reduced Braginskii equations with ion thermal dynamics in toroidal plasma Zeiler, A.; Drake, J. F.; Rogers, B. Physics of Plasmas, Vol. 4, Issue 6 https://doi.org/10.1063/1.872368	journal	June 1997
Outer midplane scrape-off layer profiles and turbulence in simulations of Alcator C-Mod inner-wall limited discharges Halpern, Federico D.; LaBombard, Brian; Terry, James L. Physics of Plasmas, Vol. 24, Issue 7 https://doi.org/10.1063/1.4989705	journal	July 2017
Non-ambipolar transport in a magnetic divertor Strawitch, C. M.; Emmert, G. A. Nuclear Fusion, Vol. 21, Issue 10 https://doi.org/10.1088/0029-5515/21/10/008	journal	October 1981
Impact of a narrow limiter SOL heat flux channel on the ITER first wall panel shaping Kocan, M.; Pitts, R. A.; Arnoux, G. Nuclear Fusion, Vol. 55, Issue 3 https://doi.org/10.1088/0029-5515/55/3/033019	journal	February 2015
Finite ion temperature effects on scrape-off layer turbulence Mosetto, Annamaria; Halpern, Federico D.; Jolliet, Sébastien Physics of Plasmas, Vol. 22, Issue 1 https://doi.org/10.1063/1.4904300	journal	January 2015
The GBS code for tokamak scrape-off layer simulations Halpern, F. D.; Ricci, P.; Jolliet, S. Journal of Computational Physics, Vol. 315 https://doi.org/10.1016/j.jcp.2016.03.040	journal	June 2016
General expression of the gyroviscous force Ramos, J. J. Physics of Plasmas, Vol. 12, Issue 11 https://doi.org/10.1063/1.2114747	journal	November 2005
Velocity shear, turbulent saturation, and steep plasma gradients in the scrape-off layer of inner-wall limited tokamaks Halpern, F. D.; Ricci, P. Nuclear Fusion, Vol. 57, Issue 3 https://doi.org/10.1088/1741-4326/aa4eb6	journal	December 2016
Plasma sheath in a tilted magnetic field: Closing of the diamagnetic currents; effect on plasma convection Cohen, Ronald H.; Ryutov, Dmitri D. Physics of Plasmas, Vol. 2, Issue 6 https://doi.org/10.1063/1.871288	journal	June 1995
Understanding narrow SOL power flux component in COMPASS limiter plasmas by use of Langmuir probes Dejarnac, R.; Stangeby, P. C.; Goldston, R. J. Journal of Nuclear Materials, Vol. 463 https://doi.org/10.1016/j.jnucmat.2014.12.100	journal	August 2015
Edge and SOL turbulence and blob variations over a large database in NSTX Zweben, S. J.; Davis, W. M.; Kaye, S. M. Nuclear Fusion, Vol. 55, Issue 9 https://doi.org/10.1088/0029-5515/55/9/093035	journal	September 2015
Edge turbulence measurements in toroidal fusion devices Zweben, S. J.; Boedo, J. A.; Grulke, O. Plasma Physics and Controlled Fusion, Vol. 49, Issue 7 https://doi.org/10.1088/0741-3335/49/7/S01	journal	June 2007
Turbulent regimes in the tokamak scrape-off layer Mosetto, Annamaria; Halpern, Federico D.; Jolliet, Sébastien Physics of Plasmas, Vol. 20, Issue 9 https://doi.org/10.1063/1.4821597	journal	September 2013
Effect of the limiter position on the scrape-off layer width, radial electric field and intrinsic flows Loizu, J.; Ricci, P.; Halpern, F. D. Nuclear Fusion, Vol. 54, Issue 8 https://doi.org/10.1088/0029-5515/54/8/083033	journal	July 2014
The Plasma Boundary of Magnetic Fusion Devices Stangeby, Peter C. Plasma Physics and Controlled Fusion, Vol. 43, Issue 2 https://doi.org/10.1887/0750305592	book	January 2000
The ITER project construction status Motojima, O. Nuclear Fusion, Vol. 55, Issue 10 https://doi.org/10.1088/0029-5515/55/10/104023	journal	October 2015

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